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CHAPTER 6: ACTUAL VALUES
METERING
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
6-21
6
DEMAND
menu. For each quantity, the relay displays the demand over the most recent demand time interval, the
maximum demand since the last maximum demand reset, and the time and date stamp of this maximum demand value.
Maximum demand quantities can be reset to zero with the
CLEAR RECORDS
CLEAR DEMAND RECORDS
command.
6.4.3.9 Frequency metering
ACTUAL VALUES
METERING
SOURCE SRC 1
FREQUENCY
The metered frequency values are displayed in this menu. The "SRC 1" text is replaced by the name programmed by the
user for the associated source (see
SETTINGS
SYSTEM SETUP
SIGNAL SOURCES
).
SOURCE FREQUENCY
is measured via software-implemented zero-crossing detection of an AC signal. The signal is either a
Clarke transformation of three-phase voltages or currents, auxiliary voltage, or ground current as per source configuration
(see the
SYSTEM SETUP
POWER SYSTEM
settings). The signal used for frequency estimation is low-pass filtered. The final
frequency measurement is passed through a validation filter that eliminates false readings due to signal distortions and
transients.
6.4.4 Tracking frequency
ACTUAL VALUES
METERING
TRACKING FREQUENCY
The tracking frequency displays here. The frequency is tracked based on the selection of the reference source with the
FREQUENCY AND PHASE REFERENCE
setting in the
SETTINGS
SYSTEM SETUP
POWER SYSTEM
menu. See the Power
System section of chapter 5 for details.
6.4.5 FlexElements
ACTUAL VALUES
METERING
FLEXELEMENTS
FLEXELEMENT 1(8)
The operating signals for the FlexElements are displayed in pu values using the following definitions of the base units.
Table 6-2: FlexElement base units
FREQUENCY
SRC 1
SRC 1 FREQUENCY:
0.00 Hz
TRACKING FREQUENCY
TRACKING FREQUENCY:
60.00 Hz
FLEXELEMENT 1
FLEXELEMENT 1
OpSig:
0.000
Base unit
Description
BREAKER ACC ARCING AMPS
(Brk X Acc Arc Amp A, B, and C)
BASE = 2000 kA
2
×
cycle
BREAKER ARCING AMPS
(Brk X Arc Amp A, B, and C)
BASE = 1 kA
2
×
cycle
BUS DIFFERENTIAL RESTRAINING
CURRENT
(Bus Diff Mag)
I
BASE
= maximum primary RMS value of the +IN and –IN inputs
(CT primary for source currents, and bus reference primary current for bus differential currents)
BUS DIFFERENTIAL RESTRAINING
CURRENT
(Bus Rest Mag)
I
BASE
= maximum primary RMS value of the +IN and – IN inputs
(CT primary for source currents, and bus reference primary current for bus differential currents)
DCmA
BASE = maximum value of the
DCMA INPUT MAX
setting for the two transducers configured
under the +IN and –IN inputs.
FREQUENCY
f
BASE
= 1 Hz
PHASE ANGLE
ϕ
BASE
= 360 degrees (see the UR angle referencing convention)
POWER FACTOR
PF
BASE
= 1.00
RTDs
BASE = 100°C
Summary of Contents for b30
Page 10: ...x B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TABLE OF CONTENTS ...
Page 486: ...5 278 B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL TESTING CHAPTER 5 SETTINGS 5 ...
Page 616: ...iv B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL ABBREVIATIONS ...
Page 632: ...xvi B30 BUS DIFFERENTIAL SYSTEM INSTRUCTION MANUAL INDEX ...